Question

which of the following is a physical change?

A. a newspaper burns when placed in a fire.
B.an iron chair rusts when left outside
C.a sample of water boils and releases gas.
D.a plant changes carbon dioxide and water into sugar

Answer 1

It’s C. This is because all of the other options you can’t turn back but if you boil water, the gas can turn back by condensation. If a newspaper burns it’s gone. If the chair rust you can only scrape off the rust. If the plant changes the CO2 you aren’t getting it back. At least not easily